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1 /*
2  * Copyright 2011 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #include "Sample.h"
9 #include "SkAAClip.h"
10 #include "SkCanvas.h"
11 #include "SkColorPriv.h"
12 #include "SkFont.h"
13 #include "SkPaint.h"
14 #include "SkPath.h"
15 #include "SkRandom.h"
16 #include "SkClipOpPriv.h"
17 
18 constexpr int W = 150;
19 constexpr int H = 200;
20 
show_text(SkCanvas * canvas,bool doAA)21 static void show_text(SkCanvas* canvas, bool doAA) {
22     SkRandom rand;
23     SkPaint paint;
24     SkFont font(nullptr, 20);
25     font.setEdging(doAA ? SkFont::Edging::kSubpixelAntiAlias : SkFont::Edging::kAlias);
26 
27     for (int i = 0; i < 200; ++i) {
28         paint.setColor((SK_A32_MASK << SK_A32_SHIFT) | rand.nextU());
29         canvas->drawString("Hamburgefons", rand.nextSScalar1() * W, rand.nextSScalar1() * H + 20,
30                            font, paint);
31     }
32 }
33 
show_fill(SkCanvas * canvas,bool doAA)34 static void show_fill(SkCanvas* canvas, bool doAA) {
35     SkRandom rand;
36     SkPaint paint;
37     paint.setAntiAlias(doAA);
38 
39     for (int i = 0; i < 50; ++i) {
40         SkRect r;
41         SkPath p;
42 
43         r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
44                   rand.nextUScalar1() * W, rand.nextUScalar1() * H);
45         paint.setColor(rand.nextU());
46         canvas->drawRect(r, paint);
47 
48         r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
49                   rand.nextUScalar1() * W, rand.nextUScalar1() * H);
50         paint.setColor(rand.nextU());
51         p.addOval(r);
52         canvas->drawPath(p, paint);
53     }
54 }
55 
randRange(SkRandom & rand,SkScalar min,SkScalar max)56 static SkScalar randRange(SkRandom& rand, SkScalar min, SkScalar max) {
57     SkASSERT(min <= max);
58     return min + rand.nextUScalar1() * (max - min);
59 }
60 
show_stroke(SkCanvas * canvas,bool doAA,SkScalar strokeWidth,int n)61 static void show_stroke(SkCanvas* canvas, bool doAA, SkScalar strokeWidth, int n) {
62     SkRandom rand;
63     SkPaint paint;
64     paint.setAntiAlias(doAA);
65     paint.setStyle(SkPaint::kStroke_Style);
66     paint.setStrokeWidth(strokeWidth);
67 
68     for (int i = 0; i < n; ++i) {
69         SkRect r;
70         SkPath p;
71 
72         r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
73                   rand.nextUScalar1() * W, rand.nextUScalar1() * H);
74         paint.setColor(rand.nextU());
75         canvas->drawRect(r, paint);
76 
77         r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
78                   rand.nextUScalar1() * W, rand.nextUScalar1() * H);
79         paint.setColor(rand.nextU());
80         p.addOval(r);
81         canvas->drawPath(p, paint);
82 
83         const SkScalar minx = -SkIntToScalar(W)/4;
84         const SkScalar maxx = 5*SkIntToScalar(W)/4;
85         const SkScalar miny = -SkIntToScalar(H)/4;
86         const SkScalar maxy = 5*SkIntToScalar(H)/4;
87         paint.setColor(rand.nextU());
88         canvas->drawLine(randRange(rand, minx, maxx), randRange(rand, miny, maxy),
89                          randRange(rand, minx, maxx), randRange(rand, miny, maxy),
90                          paint);
91     }
92 }
93 
show_hair(SkCanvas * canvas,bool doAA)94 static void show_hair(SkCanvas* canvas, bool doAA) {
95     show_stroke(canvas, doAA, 0, 150);
96 }
97 
show_thick(SkCanvas * canvas,bool doAA)98 static void show_thick(SkCanvas* canvas, bool doAA) {
99     show_stroke(canvas, doAA, SkIntToScalar(5), 50);
100 }
101 
102 typedef void (*CanvasProc)(SkCanvas*, bool);
103 
104 class ClipView : public Sample {
105 public:
ClipView()106     ClipView() {
107         SkAAClip clip;
108         SkIRect r = { -2, -3, 842, 18 };
109         clip.setRect(r);
110     }
111 
~ClipView()112     virtual ~ClipView() {
113     }
114 
115 protected:
onQuery(Sample::Event * evt)116     virtual bool onQuery(Sample::Event* evt) {
117         if (Sample::TitleQ(*evt)) {
118             Sample::TitleR(evt, "Clip");
119             return true;
120         }
121         return this->INHERITED::onQuery(evt);
122     }
123 
onDrawContent(SkCanvas * canvas)124     virtual void onDrawContent(SkCanvas* canvas) {
125         canvas->drawColor(SK_ColorWHITE);
126         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
127 
128         static const CanvasProc gProc[] = {
129             show_text, show_thick, show_hair, show_fill
130         };
131 
132         SkRect r = { 0, 0, SkIntToScalar(W), SkIntToScalar(H) };
133         SkPath clipPath;
134         r.inset(SK_Scalar1 / 4, SK_Scalar1 / 4);
135         clipPath.addRoundRect(r, SkIntToScalar(20), SkIntToScalar(20));
136 
137 //        clipPath.toggleInverseFillType();
138 
139         for (int aa = 0; aa <= 1; ++aa) {
140             canvas->save();
141             for (size_t i = 0; i < SK_ARRAY_COUNT(gProc); ++i) {
142                 canvas->save();
143                 canvas->clipPath(clipPath, kIntersect_SkClipOp, SkToBool(aa));
144 //                canvas->drawColor(SK_ColorWHITE);
145                 gProc[i](canvas, SkToBool(aa));
146                 canvas->restore();
147                 canvas->translate(W * SK_Scalar1 * 8 / 7, 0);
148             }
149             canvas->restore();
150             canvas->translate(0, H * SK_Scalar1 * 8 / 7);
151         }
152     }
153 
154 private:
155     typedef Sample INHERITED;
156 };
157 
158 //////////////////////////////////////////////////////////////////////////////
159 
160 DEF_SAMPLE( return new ClipView(); )
161